C'est à cette même conclusion qu'aboutit le rapport Donaldson : « Extensive work would also be necessary in animals to demonstrate the effectiveness of transplanting material derived from stem cells into the tissue needing repair and the long term safety of the technique (...)».
Het Donaldson-verslag eindigt op dezelfde noot : « Extensive work would also be necessary in animals to demonstrate the effectiveness of transplanting material derived from stem cells into the tissue needing repair and the long term safety of the technique (...)».